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+! Copyright (C) 2009 Slava Pestov.
+! See http://factorcode.org/license.txt for BSD license.
+USING: accessors assocs deques dlists kernel locals sequences lexer
+namespaces functors compiler.cfg.rpo compiler.cfg.utilities
+compiler.cfg ;
+IN: compiler.cfg.dataflow-analysis
+
+GENERIC: join-sets ( sets dfa -- set )
+GENERIC: transfer-set ( in-set bb dfa -- out-set )
+GENERIC: block-order ( cfg dfa -- bbs )
+GENERIC: successors ( bb dfa -- seq )
+GENERIC: predecessors ( bb dfa -- seq )
+
+<PRIVATE
+
+MIXIN: dataflow-analysis
+
+: <dfa-worklist> ( cfg dfa -- queue )
+    block-order <hashed-dlist> [ push-all-front ] keep ;
+
+GENERIC# compute-in-set 2 ( bb out-sets dfa -- set )
+
+M: kill-block compute-in-set 3drop f ;
+
+M:: basic-block compute-in-set ( bb out-sets dfa -- set )
+    bb dfa predecessors [ out-sets at ] map dfa join-sets ;
+
+:: update-in-set ( bb in-sets out-sets dfa -- ? )
+    bb out-sets dfa compute-in-set
+    bb in-sets maybe-set-at ; inline
+
+GENERIC# compute-out-set 2 ( bb out-sets dfa -- set )
+
+M: kill-block compute-out-set 3drop f ;
+
+M:: basic-block compute-out-set ( bb in-sets dfa -- set )
+    bb in-sets at bb dfa transfer-set ;
+
+:: update-out-set ( bb in-sets out-sets dfa -- ? )
+    bb in-sets dfa compute-out-set
+    bb out-sets maybe-set-at ; inline
+
+:: dfa-step ( bb in-sets out-sets dfa work-list -- )
+    bb in-sets out-sets dfa update-in-set [
+        bb in-sets out-sets dfa update-out-set [
+            bb dfa successors work-list push-all-front
+        ] when
+    ] when ; inline
+
+:: run-dataflow-analysis ( cfg dfa -- in-sets out-sets )
+    H{ } clone :> in-sets
+    H{ } clone :> out-sets
+    cfg dfa <dfa-worklist> :> work-list
+    work-list [ in-sets out-sets dfa work-list dfa-step ] slurp-deque
+    in-sets
+    out-sets ; inline
+
+M: dataflow-analysis join-sets drop assoc-refine ;
+
+FUNCTOR: define-analysis ( name -- )
+
+name-analysis DEFINES-CLASS ${name}-analysis
+name-ins DEFINES ${name}-ins
+name-outs DEFINES ${name}-outs
+name-in DEFINES ${name}-in
+name-out DEFINES ${name}-out
+
+WHERE
+
+SINGLETON: name-analysis
+
+SYMBOL: name-ins
+
+: name-in ( bb -- set ) name-ins get at ;
+
+SYMBOL: name-outs
+
+: name-out ( bb -- set ) name-outs get at ;
+
+;FUNCTOR
+
+! ! ! Forward dataflow analysis
+
+MIXIN: forward-analysis
+INSTANCE: forward-analysis dataflow-analysis
+
+M: forward-analysis block-order  drop reverse-post-order ;
+M: forward-analysis successors   drop successors>> ;
+M: forward-analysis predecessors drop predecessors>> ;
+
+FUNCTOR: define-forward-analysis ( name -- )
+
+name-analysis IS ${name}-analysis
+name-ins IS ${name}-ins
+name-outs IS ${name}-outs
+compute-name-sets DEFINES compute-${name}-sets
+
+WHERE
+
+INSTANCE: name-analysis forward-analysis
+
+: compute-name-sets ( cfg -- )
+    name-analysis run-dataflow-analysis
+    [ name-ins set ] [ name-outs set ] bi* ;
+
+;FUNCTOR
+
+! ! ! Backward dataflow analysis
+
+MIXIN: backward-analysis
+INSTANCE: backward-analysis dataflow-analysis
+
+M: backward-analysis block-order  drop post-order ;
+M: backward-analysis successors   drop predecessors>> ;
+M: backward-analysis predecessors drop successors>> ;
+
+FUNCTOR: define-backward-analysis ( name -- )
+
+name-analysis IS ${name}-analysis
+name-ins IS ${name}-ins
+name-outs IS ${name}-outs
+compute-name-sets DEFINES compute-${name}-sets
+
+WHERE
+
+INSTANCE: name-analysis backward-analysis
+
+: compute-name-sets ( cfg -- )
+    \ name-analysis run-dataflow-analysis
+    [ name-outs set ] [ name-ins set ] bi* ;
+
+;FUNCTOR
+
+PRIVATE>
+
+SYNTAX: FORWARD-ANALYSIS:
+    scan [ define-analysis ] [ define-forward-analysis ] bi ;
+
+SYNTAX: BACKWARD-ANALYSIS:
+    scan [ define-analysis ] [ define-backward-analysis ] bi ;